**9. References**


**1. Introduction** 

• Billing procedures

• Laws, technical rules and regulations

individual supply case are given.

biogas after cleaning

Fig. 1. gas conditioning by air and LPG addition

accuracy of the billing of retail customers is assured.

calorific value to that of the usually higher calorific H base gas.

conditioning

**18** 

*Germany* 

**Conditioning of Biogas for Injection** 

In the following sections, recommendations supported by schematics are given for the injection of compliant processed biogas into natural gas grids. Based on the characteristics of

• and the physical and technical conditions to be taken into account solutions for each

In order to feed biogas into a natural gas grid, unwanted components need to be removed from the gas and the burning properties of the gas need to be adjusted to those of the rest of the gas in the grid. In this way, the correct operation of the gas-burning appliances and the

The purified biogas is conditioned depending upon the properties of the base gas (Fig.1). In the case of L gas, the calorific value or Wobbe index is realised by adding air, or air and LPG. In the case of H gas characteristics, the addition of LPG is required to adjust the

LPG- and air addition high calorified L-gas

LPG addition H-gas

air addition low calorified L-gas

the natural gases distributed in Germany and taking into account the applicable

 **into the Natural Gas Grid** 

*Gaswärme - Institut e.V. Essen,* 

Frank Burmeister, Janina Senner and Eren Tali

